diff --git a/trunk/src/app/srs_app_encoder.cpp b/trunk/src/app/srs_app_encoder.cpp
index f418e02a3..826255742 100644
--- a/trunk/src/app/srs_app_encoder.cpp
+++ b/trunk/src/app/srs_app_encoder.cpp
@@ -111,11 +111,11 @@ int SrsFFMPEG::initialize(SrsRequest* req, SrsConfDirective* engine)
     
     // output stream, to other/self server
     // ie. rtmp://127.0.0.1:1935/live/livestream_sd
-    output = srs_replace(output, "[vhost]", req->vhost);
-    output = srs_replace(output, "[port]", req->port);
-    output = srs_replace(output, "[app]", req->app);
-    output = srs_replace(output, "[stream]", req->stream);
-    output = srs_replace(output, "[engine]", engine->arg0());
+    output = srs_string_replace(output, "[vhost]", req->vhost);
+    output = srs_string_replace(output, "[port]", req->port);
+    output = srs_string_replace(output, "[app]", req->app);
+    output = srs_string_replace(output, "[stream]", req->stream);
+    output = srs_string_replace(output, "[engine]", engine->arg0());
     
     // write ffmpeg info to log file.
     log_file = _srs_config->get_ffmpeg_log_dir();
diff --git a/trunk/src/app/srs_app_http.cpp b/trunk/src/app/srs_app_http.cpp
index aa2691e2a..40bc3bb24 100644
--- a/trunk/src/app/srs_app_http.cpp
+++ b/trunk/src/app/srs_app_http.cpp
@@ -338,7 +338,20 @@ void SrsHttpMessage::reset()
 
 int SrsHttpMessage::parse_uri()
 {
-    return _uri->initialize(_url);
+    // filter url according to HTTP specification.
+    
+    // remove the duplicated slash.
+    std::string filtered_url = srs_string_replace(_url, "//", "/");
+    
+    // remove the last / to match resource.
+    filtered_url = srs_string_trim_end(filtered_url, "/");
+    
+    // if empty, use root.
+    if (filtered_url.empty()) {
+        filtered_url = "/";
+    }
+    
+    return _uri->initialize(filtered_url);
 }
 
 bool SrsHttpMessage::is_complete()
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index 147bf2f00..f2802af2b 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -239,7 +239,6 @@ int SrsRtmpConn::stream_service_cycle()
         srs_error("identify client failed. ret=%d", ret);
         return ret;
     }
-    req->strip();
     srs_trace("identify client success. type=%s, stream_name=%s", 
         srs_client_type_string(type).c_str(), req->stream.c_str());
 
diff --git a/trunk/src/core/srs_core.cpp b/trunk/src/core/srs_core.cpp
index cfc9e8ada..bfa353dec 100644
--- a/trunk/src/core/srs_core.cpp
+++ b/trunk/src/core/srs_core.cpp
@@ -27,7 +27,9 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <netdb.h>
 #include <arpa/inet.h>
 
-std::string srs_replace(std::string str, std::string old_str, std::string new_str)
+using namespace std;
+
+string srs_string_replace(string str, string old_str, string new_str)
 {
     std::string ret = str;
     
@@ -38,13 +40,52 @@ std::string srs_replace(std::string str, std::string old_str, std::string new_st
     size_t pos = 0;
     while ((pos = ret.find(old_str, pos)) != std::string::npos) {
         ret = ret.replace(pos, old_str.length(), new_str);
-        pos += new_str.length();
     }
     
     return ret;
 }
 
-std::string srs_dns_resolve(std::string host)
+string srs_string_trim_end(string str, string trim_chars)
+{
+    std::string ret = str;
+    
+    for (int i = 0; i < (int)trim_chars.length(); i++) {
+        char ch = trim_chars.at(i);
+        
+        while (!ret.empty() && ret.at(ret.length() - 1) == ch) {
+            ret.erase(ret.end() - 1);
+            
+            // ok, matched, should reset the search
+            i = 0;
+        }
+    }
+    
+    return ret;
+}
+
+string srs_string_remove(string str, string remove_chars)
+{
+    std::string ret = str;
+    
+    for (int i = 0; i < (int)remove_chars.length(); i++) {
+        char ch = remove_chars.at(i);
+        
+        for (std::string::iterator it = ret.begin(); it != ret.end();) {
+            if (ch == *it) {
+                it = ret.erase(it);
+                
+                // ok, matched, should reset the search
+                i = 0;
+            } else {
+                ++it;
+            }
+        }
+    }
+    
+    return ret;
+}
+
+string srs_dns_resolve(string host)
 {
     if (inet_addr(host.c_str()) != INADDR_NONE) {
         return host;
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 604d30397..774151bf5 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "43"
+#define VERSION_REVISION "44"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "srs"
@@ -91,8 +91,13 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define SIGNAL_RELOAD SIGHUP
 
 #include <string>
-// replace utility
-extern std::string srs_replace(std::string str, std::string old_str, std::string new_str);
+// replace old_str to new_str of str
+extern std::string srs_string_replace(std::string str, std::string old_str, std::string new_str);
+// trim char in trim_chars of str
+extern std::string srs_string_trim_end(std::string str, std::string trim_chars);
+// remove char in remove_chars of str
+extern std::string srs_string_remove(std::string str, std::string remove_chars);
+
 // dns resolve utility, return the resolved ip address.
 extern std::string srs_dns_resolve(std::string host);
 // whether system is little endian
diff --git a/trunk/src/rtmp/srs_protocol_rtmp.cpp b/trunk/src/rtmp/srs_protocol_rtmp.cpp
index 53d71183a..b8a4c7bde 100644
--- a/trunk/src/rtmp/srs_protocol_rtmp.cpp
+++ b/trunk/src/rtmp/srs_protocol_rtmp.cpp
@@ -127,7 +127,11 @@ int SrsRequest::discovery_app()
     app = url;
     vhost = host;
     srs_vhost_resolve(vhost, app);
-    strip();
+
+    // remove the unsupported chars in names.
+    vhost = srs_string_remove(vhost, "/ \n\r\t");
+    app = srs_string_remove(app, " \n\r\t");
+    stream = srs_string_remove(stream, "/ \n\r\t");
     
     return ret;
 }
@@ -145,30 +149,6 @@ string SrsRequest::get_stream_url()
     return url;
 }
 
-void SrsRequest::strip()
-{
-    trim(vhost, "/ \n\r\t");
-    trim(app, "/ \n\r\t");
-    trim(stream, "/ \n\r\t");
-}
-
-string& SrsRequest::trim(string& str, string chs)
-{
-    for (int i = 0; i < (int)chs.length(); i++) {
-        char ch = chs.at(i);
-        
-        for (std::string::iterator it = str.begin(); it != str.end();) {
-            if (ch == *it) {
-                it = str.erase(it);
-            } else {
-                ++it;
-            }
-        }
-    }
-    
-    return str;
-}
-
 SrsResponse::SrsResponse()
 {
     stream_id = SRS_DEFAULT_SID;
diff --git a/trunk/src/rtmp/srs_protocol_rtmp.hpp b/trunk/src/rtmp/srs_protocol_rtmp.hpp
index bafdfcfe7..0e642a7d2 100644
--- a/trunk/src/rtmp/srs_protocol_rtmp.hpp
+++ b/trunk/src/rtmp/srs_protocol_rtmp.hpp
@@ -82,9 +82,6 @@ public:
     */
     virtual int discovery_app();
     virtual std::string get_stream_url();
-    virtual void strip();
-private:
-    std::string& trim(std::string& str, std::string chs);
 };
 
 /**
diff --git a/trunk/src/rtmp/srs_protocol_utility.cpp b/trunk/src/rtmp/srs_protocol_utility.cpp
index 6ff8ae5ea..7f600ead4 100644
--- a/trunk/src/rtmp/srs_protocol_utility.cpp
+++ b/trunk/src/rtmp/srs_protocol_utility.cpp
@@ -29,7 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 void srs_vhost_resolve(std::string& vhost, std::string& app)
 {
-    app = srs_replace(app, "...", "?");
+    app = srs_string_replace(app, "...", "?");
     
     size_t pos = 0;
     if ((pos = app.find("?")) == std::string::npos) {